code: def get_executable():
      return (
          (os.getenv("SHELL") or "/bin/sh") if os.name != "nt" else None
      )
  
file_path: dvc/dvc/stage/run.py
imports: import os
  import signal
  import subprocess
  import threading
  from dvc.log import logger
  from dvc.utils import fix_env
  from .decorators import unlocked_repo
  from .exceptions import StageCmdFailedError
label_desc: Use image node_id 6 for calling a global function with example usage: get_executable() and returns: unknown